Let-off mechanism for looms.



J. V. OUNNIFP;

LET-OFF MECHANISM FOR LOOMS.

APPLICATION IILED SEPT.7, 1909.

Patented Oct. 18,1910.

UNITED STATES PATENT OFFICE.

JOHN v. GUNNIFF, or FALL RIVER, MASSACHUSETTS, ASSIGNOR To WILLIAM F.DBAPEB, or norEDALE, MASSACHUSETTS; CLARE H. DRAPER AND OLIVER H, LANEEXECU'IORS or SAID WILLIAM E. DRAPER, DECEASED.

LET-OFF MECHANISM FOR LOOMS:

Specification of Letters Patent.

Patented Oct. 18, 1910.

To all whom it may concern:

Be it known that I, JOHN V. CUNNIFF, a citizen of the United States,residing at Fall River, in the county of Bristol and State ofMassachusetts, have invented an Improvement in Let-Off Mechanisms forLooms, of which the following description, in connection with theaccompanying drawings, is a specification, like letters on the drawingsrepresenting like parts.

The invention to be hereinafter described relates to let-oil mechanismsfor looms, and more particularly to the type known as friction let-offs.

- is effected automatically Tl1e.aims and purposes of the presentinvention are to provide a let-off Inechanism wherein the adjustment ofthe warp tension by a.' combination of the results due to the decreasinweight and diameter of the yarnmass as t e beam unwinds, and is d'es'ined as a simple form of such device, as wi l hereinafter more fullyappear.

The following description and accompanying drawings 'disclose one formor em.- odiment of means for carrying the present invention intopractical effect, it' being understood that the invention in its truesco e i is not-restricted to the particulars or detalls broken away,

except as hereinafter pointed out by the claims.

In'thedrawing: Figure 1 is a side view,

' showing the loom frame, the warp beam and the features ofth'e presentinvention as related thereto; Fig. 2 isa rear elevation of one end. ofthe warp beam and a part of the loom framing with the'present inventionas- 3 1s a sectlonal detail on the line 3-3 of 1 with parts The loomframe 1 may be ofany suitable character and, if desired, it may be'provided with the whip roll supporting brackets 2 seen-red to the loomframe asiby' bolts 3, said brackets being provided with a series ofsockets 4 to sup ort'the whip roll-5 in desired position, it beingunderstood that while the present 'drawin s show only one end of thewarpbeam an adjacent framin the other end and'adjacont arts may e andpreferably-are duplicates't ereof. I l

,The loom frame 1 is provided with a sup-- porting, bracket 6,preferably, though not necessarily, extending inwardtherefrom, to

that

wardly extending arm 10 of the bell crank is formed asa bear-mg tosu'pport'the journals of the warp beam, while-the other arm 11 of thefrictional retarding devicels pro vided with a friction pad 14 adaptedto bear upon the head 12 of said beam, the construction being such thatthe friction pad 14 will be pressed against the'head 12 of the Warpbeanrwith a degree of pressure dependent upon the weight of the warpbeam and its load.

- The warp beam 13 has journals 15 pro jecting from the endsthereof, andmeans are provided to adjust the point of transmission of the weightofthe warp beam and its load to the bearing arms 10 of the frictionalretarding device. As one means for varying this point of transmissionand consequently altering the leverage or frictional retarding effect ofthe beam, the journals 15 o the warp beam are provided with anadjustable'bearing collar 16 preferably splined thereto, as indicated in'Fig. 3, and held in adjusted osition longitudinally thereof bymeans 0 aset screw pad 14 on the warp -17 or the like, the construction beingsuch that, upon adjustmentvof the bearing collar 16 to difierent pointson the journals 15 of the warp beam, the frictional retarding effectofthe pad l4;'onthe warp beam will be ment be carried by the journals ofthe war beam or. by .the bearing arms 10 of sai frictional retardingdevice. It will like wise be obvious that while the frictional retardingdevice may be formedas a-bell.

crank lever, such as herein indicated, its form may be variouslychanged, the essenthe warp beam delivered upon one portifals inthisrespect being that the weight. o

vice may be transmitted to the Warp tion of thelever or frictionalretarding debeam in a manner to retard its rotation In proportion to theweight ofi'he warp beam and its load.

From the construction described it will be apparent that when a pullortension is placed upon the warp threads 18 which pass from the warpbeam over the whip roll 5, such tension will tend to rotatethe war ing'effect 0 the frictional retarding device,

whi'ch is itself dependent ilIpOn t-hexweight uniform tension wilwagrp'threads as the warp .a fullto empty condition.

of the beam and its load. I As the warp beam unwinds itryill likewise.be obvious that'its weight will decrease, while at the same time'the'leuerage or pull-exerted by the tension of tl ie .iw-arp threadswill be correspondingly less',;,;the effect bein be placed upon the beampasses from- By the 'a just-able means for transmitting theweightof-thewarp beam and its load to the frintio'nal retarding device,proper adjustment may bemadefor the var-'ing conditions of use. lat isclaimed is: v 1. In- 'a friction let-ofl"mechanism for looms,the'comb'ination of a warp beam, anda frictional'retarding device toautomatically govern the rotative-movement of the .warp' beam inproportion to the weightthereof and comprising a lever pivoted beabearing tportion to sustain the tweenits ends to form two arms, onehaving warp beam and the other arm. of said lever having a portion toengage the beam. v 4

2. In aafI'1Ct1OI1 let-.ofi mechanism for looms, the combination one armextending from its'fulcrum to sus- Il tain the warp beam, and anotherarm ex- :te'ndin'g from the fulcrum in another 'direc engagethe e'rn'the rotative movementof ,movement of the warp the/weight thereofsustained 'hy the first .tion and carrying a member bearing directlg;

fupon the-warp beam'to control -.the rotative beam according'tomentioned a'rm. r

1'3. In a. friction'letf-ofi' jmechanism for; looms, the=combinationof awarp beam, and

a; lever fulc'rumed between-its ends on. the loom frame and'having twoarms, one to sup rt the'zwarp beam andthe other exrection, and'p'rovidedwith a friction pad to head-of the. .warp bea m and govproportiontoitsweight. w

4.. In africtionlet-01f mechanism looms, the cgmbination of a warp."beam, a

le rer afulcruined on the loom frameand. havf ingjon'e arm-forfsustaining the warp-beam means fori-adjusting'ithe pointof supportbeam, beam in op osition to the frictional retar that a substantiallyofawarp beam, a] lever-pivoted between its ends and having;

tendiilg from the fulcrum in a different di-.

the beam I,

the war beam on said arm, and another arm acting irectly upon the headof the warp beam to govern its rotation in proport on to the eifectiveweight of the warp beam.

5. In a friction let-off mechanism for looms, the combination of a warpbeam having journals, .a lever fulcrumed between its ends onthe loomframe and havin a bearing arm to sustain a journal of the warp andanother arm acting on the warp beam to govern the rotative movement of,the warp beam in proportion to the efl'ective' weight sustained by Ithe bearing arm, and means for adjusting the point of support of saidjournal on the bearing arm.

6. In a friction let-off mechanism for looms, the combination of a warpbeam having journals, a lever ,fulcrumed on ,the loom h frame and havinga bearing-arm to sustain a journal ofv the ,warp beam, and another armacting to govern therotative movement of the .warp beam in proportion tothe effective weight sustained by the bearing arm,

7.- In a friction let 40a mechanism for frame and having a bearing armto sustain the warp beam, the'other arm of said bellcrank lever actingon the head of the warp beam to retard the rotative movement of the andan adjustable collar mounted on. the

journal and interposed between the journal and bearing arm.

' looms, the combination of a warp beam, and 1 J'a bell-crank leverfulcrumed on the machine warpbeam in proportion to the weight of saidbeam transmitted to the bearing arm.

8. In a friction let-off ,mechanism for looms, the combination of a warp,beam, a

lever pivoted between its ends on the loom frame and havlng a bearlngarm for sustaining the journal'of said beam, and an adjustable blockmovable along said bearing arm and interposed between it and the-warpbeam journal, the other arm of said lever looms, the combination of"awarp beam, a

be m,

said arm of the lever, the other arm'of said lever extendingfrom. theftilcrumin adif ferent direction warp beam.-

"and bearing, against the? f- M In testimony whereof, I liave'signed myj.

name to this specification, in the presence of two subscribingwitnesses. v

. I YJQHNGUNNI F witnessesi I S; .W.- 1Asn'rb 'JoHiv Bncxrlnv.

